John Baldwin 5dd723425e Define max_align_t for C11.
libc++'s stddef.h includes an existing definition of max_align_t for
C++11, but it is only defined for C++, not for C.  In addition, GCC and
clang both define an alternate version of max_align_t that uses a
union of multiple types rather than a plain long double as in libc++.
This adds a __max_align_t to <sys/_types.h> that matches the GCC and
clang definition that is mapped to max_align_t in <stddef.h>.

PR:		210890
Reviewed by:	dim
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D8194
2016-10-21 23:50:02 +00:00
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